Hydraulic main pump seal kit for CAT336D series — high-pressure piston pump reseal for major hydraulic service.

Complete seal set for the main hydraulic pump on excavators. Cross-referenced to original CAT factory part numbers parts.

Kit contents:
- Shaft seals (HNBR/PU for high-pressure service)
- Static O-rings and back-up rings
- Port plate / valve plate seals
- Servo piston seals (where applicable)
- PTFE back-up rings throughout

Materials: HNBR for high temperature and pressure, PTFE back-up rings to prevent extrusion at peak pressure spikes.

Application notes:
- Always replace seals when pump is opened — never reuse
- Inspect swash plate and pistons for wear during reseal
- Bleed system carefully on first startup to prevent cavitation

Fits CAT336D main pumps.

Stocked in Surrey, BC. Same-day dispatch on orders placed before 2 PM PST.